FR2656820A1 - TOOL HOLDER ASSEMBLY PROVIDED WITH A PROBE. - Google Patents

Abstract

The present invention relates to a tool holder assembly, essentially constituted by a central tool holder shaft (1) provided, on the one hand, with a mounting cone for fixing in a machine tool spindle and, on the other hand part, on the side opposite the cone, of an intermediate cylindrical body provided at its front part with a means for fixing a tool, characterized in that it is further provided with a device (2) for probing centered on the central shaft (1) and guided in translation on the latter, a means of lubrication and a means for cleaning the location of the machining at the level of the application of the probing device ( 2).

Description

Tool holder assembly with a feeler device

invention relates to the field of

  machine tool accessories, in particular machine tools

  nes specially intended for particular machining operations such as the production of extremely precise holes, bores and millings in depth on all types of planes, namely rectilinear, curved or curved, to allow the installation in these machining of fastening rivets, more particularly

  in the field of aeronautical and space construction

tial.

  A milling operation using machi-

  nes automatic requires an immediate stop of said machines

  as soon as the required milling depth is obtained

  relative to the skin of the workpiece This depth

  deur must be observed very rigorously so that, when mounting the rivets and fixing them

  in the drilling and milling of the workpiece,

  no rivet protrudes or is set back from the skin of the part, which would result in turbulence

  harmful aerodynamics on all parts.

  The object of the present invention is to provide a

  tool holder assembly intended for extreme machining

precise and repetitive.

  In fact, in accordance with the invention, the tool holder assembly, which essentially consists of a central tool holder shaft provided, on the one hand, with a mounting cone for fixing in a machine tool spindle

  and, on the other hand, on the side opposite the cone, of a cy-

  the intermediate lindric provided at its front part with a means of fixing a tool, is further provided with a feeler device centered on the central shaft and guided

  in translation on the latter, of a lubricating means

  tion and a means of cleaning the machining location at the application of the feeler device. The invention will be better understood, thanks to the

  description below, which relates to an embodiment

  sation preferred, given by way of non-limiting example, and explained with reference to the accompanying schematic drawings, in which: Figure 1 is a plan view in section of a tool holder assembly according to the invention; Figure 2 is a side elevation view

  and partially in section of the following tool holder assembly

before Figure 1;

  Figure 3 is an elevational view through the rear

  tool holder assembly; Figure 4 is an elevational view from the front of the tool holder assembly; Figure 5 is a sectional view along A-A of Figure 2; Figure 6 is a sectional view along B-B of Figure 4; Figure 7 is a view similar to that of Figure 1 of an alternative embodiment of the tool holder assembly; Figure 8 is a partial sectional view of the probe cover of the assembly according to Figure 7, offset from the latter; FIG. 9 is a partial sectional view of the lubricant supply connection, and FIG. 10 is a half-view similar to that of FIG. 8 showing the probe cover in a position offset from those of FIGS. 7 and 8. According to the invention and as shown more particularly, by way of example, Figures 1 to 4 of the accompanying drawings, the tool holder assembly which is

  essentially constituted by a central tree

  tool 1 provided, on the one hand, with a mounting cone for fixing in a machine tool spindle and, on the other hand

  part, on the side opposite the cone, of a cylindrical body

  intermediate provided at its front part with a fixing means

  tion of a tool, is further provided with a feeler device 2 centered on the central shaft 1 and guided in translation on the latter, with a lubrication means

  and a means of cleaning the location of the factory

  ge in the application of the probing device 2.

  The central tool-holder shaft 1 has at its rear part a standardized cone extended forwards by an intermediate cylindrical body ending in a means for fixing a tool such as a milling cutter, a drill, etc., and is additionally provided with an axial screw

  22 for adjusting the positioning of the tool in length.

  The fixing means can be, in known manner, a clamp holder 23 with clamps and nut screwed onto the front part of the central shaft 1, or even a fixing device by cylindrical bore of the Weldon system type

  or Whistle-Notch, or any other means of attachment.

  The feeler device 2 consists of a

  cylindrical body 3 centered on the central shaft

  tools 1 by means of bearings 4, protected outwards

  laughter of the body 3 by sealing rings 33 and pressing against the shoulders of said body 3 by means of spacers 35, seals 36 sealing inwardly of the body 3, which is blocked in translation on said shaft 1 by means of a nut 21 itself locked in position by flat-ended screws 24, by a feeler cover 5 extending over the part

  front of the tool holder assembly concentrically to the

  til, by a stop plate 6 connected to the cylinder body

  drique 3 on its side facing the cone of the central tree

  tral 1 and by an indexing support 7 positioned on the body 3 by means of a pin 8, fixed on said body 3 by means of a screw 9 and carrying a coding device, such as an electronic chip or the like The rings 33 are intended to prevent any penetration of impurity from

outside towards the bearings 4.

  At its rear end carrying the stopper plate 6, the cylindrical body 3 has an eccentric part 11 carrying an air supply connection 12 and a water supply connection 13 (FIG. 3) fixed

  by means of screws 37 and connected, via

  respective channels 12 'and 13' (FIG. 5), to corresponding columns of air inlet 14 and water inlet 15 mounted so as to be displaceable in translation in the cylindrical body 3 against the action of guided springs 16

  on nipples 17 supported by pins 18 diameters

  trally opposite housed in the body 3 and cooperating,

  for guiding and limiting the movement of co-

  lanes 14 and 15, with lights provided in the ex-

  hoppers of these columns 14 and 15, the tightness of the mounting

  ge columns 14 and 15 in the cylindrical body 3 being provided by O-rings 19 tightened by means of plugs 20 and said columns 14 and 15 bearing

  their opposite end the probe cover 5.

  The probe cover 5 is fixed, on the one hand, to the water inlet column 15 by means of a screw 25 and to the air inlet column 14 by means of two needle screws 26 and the respective water supply and air supply lines of said columns 15 and 14 are connected

  to corresponding annular chambers 27 and 28 deli-

  mites in said cover 5, on the one hand, by a ring washer in two segments 29 and, on the other hand, by an external closing ring 30, said chambers 27 and 28 opening respectively at the front of the internal part of cover 5 and on the front face of the latter via bias channels 31 and nozzles

air inlet 32 (Figure 6).

  The abutment support plate 6 is, on the one hand, fixed on the air inlet 14 and water inlet 15 columns

  by means of countersunk head screws 38 penetrating into the

  mity of said columns comprising the passageways of the pins 18, at the rear of these lights and, on the other

  part, provided with at least one, preferably two,

  micrometric tees 39 intended to cooperate with corresponding micro-contacts provided on the frame of the spindle of the machine tool The micrometric stops 39 are, in known manner, produced in the form of rods

  fitted at one end with a micrometric thread penetrated

  trant in a corresponding thread secured to the stopper plate 6 and capable of being locked in position

  adjusted by means of a lock nut.

  Of course, a single micrometric stop is

  sufficient to trigger the machine when

  the arrival at the end of the preset machining stroke, the two

  xth stop being only intended to ensure a

  better operational safety.

  The water supply pipe of the rear column

  water bank 15 is connected, moreover, through

  diary of an annular chamber 40, delimited on the surface

  outer face of said column 15, and of a channel 41 passing through the body 3 at the level of said chamber 40 and

  externally closed by a plug 42, to an an-

  ring 43 delimited between the seals 36, the internal surface of the body 3 and the external surface of the intermediate cylindrical body extending the central shaft 1 forwards, said chamber 43 itself opening out by

  through a through hole 44 in a cham-

  annular bre 45, machined on the body of the axial screw 22

  and delimited by seals 46, said chamber

  bre 45 being connected by a radial blind bore to an axial blind bore 47 leading to its front face for fixing the tool Thus, it is possible to carry out central lubrication when using tools with an oil hole , peripheral lubrication can be prevented by using a longer screw 25 and peripheral lubrication by mounting

  as shown in Figure 1.

  Of course, it is also possible to

  simultaneously read a central lubrication and a

  peripheral lubrication. Furthermore, in a manner known per se, the bearing clearances 4 ensuring the guiding in rotation of

  the shaft 1 in the probing device 2 are advantageous

  lubricated by lubrication by means of grease nipples

shown in the drawings.

  Figures 7 to 9 of the accompanying drawings show

  try alternative embodiments of the invention.

  Figure 7 is a plan view and section, on a larger scale, similar to that of Figure 1, wherein the central shaft 1 is provided with a bore 48 for mounting the shank of the tool which is tightened by means of a screw cooperating with an inclined plate of said tail and penetrating into a tapped hole 49 inclined at 4 by

  relative to the perpendicular to the tool axis and access

  visible through a hole 52 (FIG. 10) provided for this purpose in the wall of the probe cover 5 ′ which has greater clearance around the tool, as well as channels 50 for direct outlet of the cleaning air ( Figure 8) The greater clearance of the probe cover 5 'allows better evacuation of the chips and

  the provision of direct air outlet channels 50 for

  avoids mounting small complementary tubes.

  Finally, FIG. 9 of the attached drawings showing

  feels an alternative form of fitting the fitting

  13 lubrication water supply, which is advanced

  taggedly provided with a non-return valve 51.

  The device according to the invention operates as follows: The manipulator arm of the machine is provided at a very specific location with a centering finger intended to cooperate with the indexing support 7 in view

  the indexing of the tool holder assembly in accordance with the

  vention in an immutable position This indexing is necessary

  for the automatic change of the holder assembly

  tools between the spindle and the transfer to the tool magazine This is particularly possible because the spindle is also stopped with a very

  strict Thus, when the spindle stops, the holder assembly

  tools will always be presented facing the indexing on the spindle frame and kept in the position on the

  spindle with supply connections 12 and 13.

  During machining, the machine frame, including the spindle, moves axially in the direction of the workpiece, only the central tool holder shaft 1 being rotated during machining operations and behaving thanks to the bearings 4 like a rotary joint for lubrication, the probing device 2 with all of its accessories remaining fixed in rotation, owing to the fact that the supply fittings 12 and 13 are engaged in the

  fixed support provided on the spindle frame.

  In device 2, only an axial movement

  two columns 14 and 15, as well as the pal-

  fear 5 and the stop plate 6 with the two stops

micrometric 39 is possible.

  At the start of machining, the tool holder assembly mounted in the machine spindle is present in the

  position shown in figure 1, the palpa- cover

  ge 5 being in the advanced position under the action of the springs 17, the central tool being fixed in the shaft 1 in mandrel

  clamp or in a Whistle-type fastening system

  Notch, with a preset overshoot value for

  read the required milling depth The cutting tool

  pe will then be adjusted by means of the axial screw 22, such that

  the way that at the time of tripping the stroke of the feeler support columns 14 and 15 in the body 3 of the feeler device 2 is equal to half or two-thirds of the maximum possible stroke When the desired depth is reached after application of the

  front side of the probe cover 5, the two micro stops

  metrics 39 are set to trigger the

  corresponding micro-contacts, which are intended for reversing

  tighten the axial movement of the frame and spindle assembly of the machine.

  The machine tools used for such uses

  swims are provided with a universal spindle head

  grammed in order to be able to follow all forms of parts

  these to be machined, so that said head always appears

  days with its axis perpendicular to the workpiece After

  adjustment of the tool holder assembly the distance from the

  this to the spindle can vary without influencing the depth of the milling which will always be strictly identical thanks to the micrometric stops 39 and the control of the

  return of the spindle by the corresponding micro-contacts

  dants In known manner, the arrival of air and water is programmed with respect to the machining phase and the

  air jets which are pulsed at the front of the pallet cover

  page 5 are intended to clean the factory location

  before applying said probe cover to the

  workpiece, to avoid any interposition of co-

  skins, or others, between the face of the cover and the part,

  which would result in non-compliance with the pro-

founder of milling.

  Thanks to the invention, it is possible to realize

  ser a tool holder assembly allowing the realization

  particularly repetitive machining operations

  in particular in the aeronautical construction sector

nautical and spatial.

  Of course, the invention is not limited to

  embodiment described and shown in the drawings an-

  modifications Modifications remain possible, in particular from the point of view of the constitution of the various elements or by substitution of technical equivalents, without leaving

  provided the scope of protection of the invention.

Claims (7)

R E V E N D I C A T I O N S   1 Tool holder assembly, mainly consisting of   formed by a central tool-holder shaft (1) provided with a   part, a mounting cone for fixing in a bro-   machine tool and, on the other hand, on the side opposite the cone, an intermediate cylindrical body provided with its   front part of a tool attachment means, characterized   laughed in that it is further provided with a feeler device (2) centered on the central shaft (1) and guided in translation on the latter, with a lubrication means and a means of cleaning of the machining location   at the application of the probing device (2).   2 assembly according to claim 1, charac-   terized in that the feeler device (2) is constituted   killed by a cylindrical body (3) centered on the central shaft   tral tool holder (1) by means of bearings (4),   managed towards the outside of the body (3) by sealing rings   cheeness (33) and leaning against shoulders of said   body (3) by means of spacers (35), seals   cheeness (36) sealing inwardly of the body (3), which is blocked in translation on said shaft (1) by means of a nut (21) itself locked in position by flat-tipped screws (24), by a probe cover   (5) extending over the front part of the carrier assembly   tools concentrically to the tool, by a holder plate   stop (6) connected to the cylindrical body (3) on its side   facing the cone of the central shaft (1) and by a sup-   indexing port (7) positioned on the body (3) by means of a pin (8), fixed to said body (3) by means of a screw (9) and carrying a coding device   (10), such as an electronic chip.   3 assembly according to claim 2, charac-   terized in that, at its rear end carrying the plate   that the abutment holder (6), the cylindrical body (3) has   an eccentric part (11) carrying a supply connection   air (12) and a water supply connection (13) fixed by means of screws (37) and connected, via respective channels (12 'and 13'), to corresponding columns d air inlet (14) and water inlet (15) mounted in translatable manner in the cylindrical body (3) against the action of springs (16) guided on pins (17) supported on diametrically opposite pins (18) housed in the body (3) and   cooperating, for guiding and limiting movement   columns (14 and 15), with lights provided   in the ends of these columns (14 and 15), the seal   fitting of the columns (14 and 15) in the cylindrical body (3) being ensured by O-rings   (19) tightened by means of plugs (20) and said colon-   nes (14 and 15) carrying at their opposite end the cover probe ring (5).   4 Together, according to any of the   vendications 2 and 3, characterized in that the cover   probe (5) is fixed, on the one hand, to the rear column   water inlet (15) by means of a screw (25) and on the colon-   air intake (14) by means of two needle screws (26) and the respective water supply and air supply lines of said columns (15 and 14) are connected   to corresponding annular chambers (27 and 28)   limited in said cover (5), on the one hand, by a ring washer in two segments (29) and, on the other hand, by an outer closing ring (30), said chambers (27 and 28) opening out respectively at the front of the internal part of the cover (5) and on the front face of the latter by means of channels   bias (31) and air inlet nozzles (32).   Assembly according to any one of Claims 2 to 4, characterized in that the abutment plate (6) is, on the one hand, fixed on the air intake columns (14) and d water inlet (15) by means of   countersunk head screw (38) penetrating into the end of the   your columns with the lights of passage of the gou-   cells (18), at the rear of these lights and, on the other hand, provided with at least one, preferably two micrometric stops (39) intended to cooperate with corresponding micro-contacts provided on the frame of the machine tool spindle.   6 Together, according to any one of the   vendications 2 to 5, characterized in that the conduct   of water supply from the water inlet column (15) is re-   linked, moreover, through an an-   ring (40), delimited on the outer surface of the   said column (15), and a channel (41) passing through the body   (3) at said chamber (40) and closed outside-   ment by a plug (42), to an annular chamber (43) delimited between the seals (36), the surface   internal body (3) and the external surface of the body cy-   the intermediate shaft extending the central shaft (1) towards the front, said chamber (43) opening itself through a through bore (44) in an annular chamber (45), machined on the body of the axial screw (22) and delimited by seals (46), said chamber (45) being connected by a radial blind bore to an axial blind bore (47) emerging   on its front side for fixing the tool.   7 Together, according to any one of the re-   vendications 1 and 2, characterized in that the cover   probing (5 ') has greater clearance   turn of the tool, as well as di (50) outlet channels   cleaning air and is provided in its wall with a hole (52) allowing access to the tapped hole (49), inclined at 4 relative to the perpendicular to the axis of the tool and intended for the latter's clamping screw in   the bore (48) of the central shaft (1).   8 assembly according to claim 3, charac-   advantageous in that the lubrication water supply connection (13) is advantageously provided with a check valve no return (51).